在 PHP 中添加数组值的问题

Question

我在对象数组中有一些数据，我需要对存储在 $data['gross'].

中的值求和

$data = [
 [
 "title" => "The World's End",
 "genre" => "Sci-fi",
 "year" => 2013,
 "gross" => 26004851
 ],
 [
 "title" => "Scott Pilgrim vs. the World",
 "genre" => "Sadness",
 "year" => 2010,
 "gross" => 31524275
 ]
];

我用循环试过这个：

for ($i = 0; $i <= (count($data)-1); $i++) {

   foreach ($data[$i] as $id => $row) {

      $sum = 0;     
 
      if ($id == "gross") {

         $sum += $row;
      }

      echo $sum;

   }

}

但不是将它们相加，而是将数字连接为字符串。为什么？我试图回应这个变量的类型，但它始终是一个整数。请问是哪里出了问题？

Answer 1

一行代码即可实现：

$data = [
 [
 "title" => "The World's End",
 "genre" => "Sci-fi",
 "year" => 2013,
 "gross" => 26004851
 ],
 [
 "title" => "Scott Pilgrim vs. the World",
 "genre" => "Sadness",
 "year" => 2010,
 "gross" => 31524275
 ]
];

$sum = array_sum(array_column($data,'gross'));

echo $sum;

使用此输入

$sum 将是 57529126

在 PHP 中添加数组值的问题

Problem with addition of array values in PHP

php

arrays

addition